Improved machine for refitting- conical valves



cnARLE's. F. HALL, 4or BRooK-LYN, NEW Youn.

Letters Patent No. 100,617, (lated March S, 1870.

IMPROVE!) MACHINE FOR REFTTING- CONICAL VALVES.

The Schedule referred to in these Letters Patent and making pm of the same To all 'whom 'it may concern.-

Be it known that I, CHARLES F. HALL, ofthe city of Brooklyn, in the county of Kings, and State of New York, have invented a new and useful Improvement in Machinery for Refitting Conical Valves; and I do hcrebydeclare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make anduse the same, reference being had to the accompanying drawing forming part of this specification.

This invention relates to improvements in machinery i for refitting the valves of globe-valves, and has for its object to provide machinery having greater efficiency than anyvnow in use for the purpose.

The invention consists in the improvedI cons'rrncf tion, arrangement, and combination of parts, as will be hereinafter fnorefnlly described.

Figure 1 represents an elevation, partly in section, of a machine for fitting the val`ves, showing the ar. rangements of the milling-tool, and the tail-stock for feeding and 'securing atany position; also, the arrangement of the milling-tool for adapt-ation to fit wing-valves.

Figure 2 represents an Y'enlarged thee-view of the milling-tool.

y Similar letters of reference indicate coiresponding parts. A y

In the machines now in,` use forl refitting these. valves and valveseats the mills for the valves consist either of conical mills orsections of hollow cones, the sides of which converge at the axis, or so .nearly so that only conical valves can bc fitted in them. The) are also arranged, .both the stock of the mill for the valves and the reamer, so that they are dependent for the feed upon the pressure imparted by the operator in the lengthwise.direction of the said stocks, when he turns them by the cranks applied to thc square ends thereof.

It is impossible under this arrangement for the operator to so graduate the pressure at the finishing of the operation as not to leavel across the faces of the valves or seats, the marks of the edges of the cutters, or to so gradually lessen the depth of the out as to .terminate the cutting smoothly and truly; conscquently, the surfaces are often chattered and groovod to such an extent that the valves will leak.

To obvate this difficulty, I have provided the screwthreads a on the stocks of both the milling-tools A and the tail-siock li; also, the feeding and setting nuts c c'.

Thevalves to .be fitted are suspendedupon the points d and c in the usual way, and pressed against the cutters of the mill A. In this example I have arranged both the spindles for feeding and revolving as may be preferred. l

When the tool-z\` is revolved, (which may be donc by a crank on the square shank j,) it is fed up to the valve y by the nut c, which may be gradually turned by the operator luntil veryl nearly the desired amount or part of the valve has been turned off. Then, allowin the nut to remain fixed in its position and the tool A to continue its revolution, the valve will be smoothly finished, with the removal of only a slight remaining or additional portion thereof.

The milling-'tool holder A carries tools D or toolstocks l), which are .adjustable to or from the center, for valves of various sizes, and it Avis provided witha central recess, E, for the reception o; the' wings F of Whig-valves.

The cutting-tools areformed to be adjusted for eutting down close to the point of junction of the wings with the valves. v

The tail-stock B is screw-threaded on the exterior, and fitted to corresponding threads in the bearing y, and provided with a milled handavheehH, or other device, for turning it to Yfeed the spindle e forward.'

, When it may be preferred to employ this modeof feeding insteadmf feeding the stock A, the latter held from rotating in this case by the screw K. Y

The stock B is tubular, and supports a spindle, having a collar, 7|., against which the end' of the hol'- low stock works. ,I'

The said spindle also carries a dog, i, detachahly connected to it. This kdog engages with the l1andwheel of the valvefstem, to either hold it or carry it around in turning.

The jam-uut c', on the stock B, screwing up against the bearing G, secures the stock firmly in the required position when the feeding has been done by t-he'stock B', and arrested to hold the parts for finishing off the face of the valve, or when it is to be held rigidly and the feeding done ly the stock ofl `the milll A.

The spindle e maybe held against tho action of the milling-head, when the latter is turned, by a set-screw arranged ill any preferred way, or byany other suitable device.

The cntterholders D are represented in figs. l and 2 as arranged for adjustment by hand, and to he secured by set-screws.

Having thus described my invention,

What I. claim as new, and desire to secure by Letters -Patent, is-

1. The combination of hollow scrmv-shaft B, thrcadcd sleeve G, arm i, collared spindle c, and jam-nut c', all arranged and operating together in the manner described.

2. The combination of head-stock A,'li. ving male thread a on its shaft extension, and recess E, as shown, with threaded nut C, ystationary sleeve G, and cutters D, all constructed and arranged as and for the purpose specified. f

3. The construction and arrangement of the two devices above claimed, with respect to each other, in

the manner shown and described, for the purpose of giving a feed in either direction at the will of the opeiator.

The above specification of my invention signed by me this 19th day of May, 1869.

G. F. HALL.

Witnesses z FRANK BLOCKLEY,V O. L. TOPLIFF. 

